I treated our shelter as "wet" in every regard but the "in use cover". I really avoid them unless absolutely necessary if they are not going to be "in use". They just become wasp condos.That is one of the places where I think NFPA has exceeded their mission.
If anyone would call me on it I would say we pressure clean this area once a month. 406.6(B)(1)Ex
Exception: 15- and 20-ampere, 125- through 250-volt receptacles installed in a wet location and subject to routine high-pressure spray washing shall be permitted to have an enclosure that is weatherproof when the attachment plug is removed.
